code: def check_triangle_inequality(method, h1, h2, h3):
      """Classic test for a metric: dist(a,b) < dist(a,b) + dist(a,c)"""
  
      d12 = method(h1, h2)
      d23 = method(h2, h3)
      d13 = method(h1, h3)
      assert d12 <= d13 + d23
  
file_path: medpy/tests/metric_/histogram.py
imports: import numpy
  from hypothesis import given, strategies, assume, Verbosity, note, event
  from hypothesis import settings
  from medpy.metric import histogram
label_desc: Use image node_id 7 for calling a global function with example usage: check_triangle_inequality(method, h1, h2, h3) without return types